This will reduce the second stage release of the trigger but if you go too far it can cause a safety issue by letting the hammer release when it shouldn't, you can end up with a full auto rifle and no way of stopping it from firing; it can continue to fire until it runs out of ammo.

While that is one part of improving the trigger that's not everything that can be done to improve it and this is not a complete NM trigger job.

This is esentually the same approach used by Springfield Armory on their NM M1A.
It is not a proper way to tune a trigger. Yes, it will remove creep from the second stage and can be set to the required 4.5 pound pull, but it ignores the relationship of how the other parts interact while engaging. The result will be rapid, excessive wear and failure to maintain the proper weight of pull.